APPLICATION NOTE 2016_FEB2 DT Rev 10
Edgetech Instruments Inc. An ISO 9001 Certified Company
399 River Road . Hudson . MA . 01749 Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348
Using the DewTrak II Dew Point/ Humidity Transmitter
The Model DewTrak ll™ Dew Point/Humidity Transmitter is a compact, cost effective, optical chilled mirror hygrometer. It is designed to continuously measure the moisture content in gases. The DewTrak II uses the chilled mirror dew point temperature condensation principle to determine the water vapor concentration in gas mixtures, and a precision platinum resistance thermometer to measure the mirror temperature. With its modular design, it is available in a variety of mechanical configurations to accommodate a wide array of applications. The D-Probe allows the sensor to be used in a wide array of applications. It may be mounted directly to the DewTrak II chassis for ambient air monitoring or it can be mounted remotely for direct insertion into glove boxes, HVAC ducts, environmental test chambers, circulation pipes, refrigerated storage rooms, engine test filter rooms, and many other manufacturing environments.
The DewTrak II control module offers many standard features including:
PRIMARY STANDARD MEASUREMENT: Two Stage Chilled Mirror Sensor Probe
Two selectable Analog Outputs (4-20 mA or Voltage)
RS-232 Serial Interface
Two programmable electrically isolated alarm relays
24VDC Power Input
Common Applications of the DewTrak II
HVAC Duct Systems: Primary Standard
Purged Atmosphere: Glove Box
Environmental Chambers
Isolation Chambers: PHARMA
Engine Testing: Air Intake& Exhaust
Modified Atmosphere Packaging
SEMICON: Furnace/ Lithography
Medical Packaging
Dryer Efficiency
Pharmaceutical Testing
Biologics & Cell Culture
Fluidized Beds
Food Storage / Packaging
Air Make-Up Clean Rooms & Data Centers
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
DewTrak II
Measurement in Ambient
Environment by Diffusion Sampling
Primary Standard Chilled Mirror measurement technique
NIST Traceable
Simple, Easy to use
§ HVAC Test Chambers
§ Environmental Chambers
§ Corrosion Testing
§ Lithium Battery Manufacture
§ Clean Rooms
§ Packaging Rooms
§ Controlled Atmosphere Rooms
§ Engine Filter Rooms
§ Pharmaceutical Storage
§ Food Storage
§ Engine Test Cell Monitoring
OUTPUTS
Analog Voltage & 4-20 mA
RS-232 Serial Interface
Alarm Relays
Standard 24 VDC Power
APPLICATION NOTE 2015_09_16 DTK Rev 6
Edgetech Instruments Inc. An ISO 9001 Certified Company
399 River Road . Hudson . MA . 01749 Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348
www.edgetechinstruments.com
Using the DewTrak II Local Mount Sensor
The DewTrak II can be fitted with a local mounted chilled mirror sensor and optional Precision Air Temperature Sensor for monitoring ambient environments within buildings, clean rooms, glove boxes, test chambers, and isolation chambers. Very compact and economical, the Dewtrak II provides absolute, NIST Traceable measurements of Dew Point, RH and moisture for a variety of applications.
Using the DewTrak II Remote Probe Sensor
The DewTrak II can be fitted with a remote mounted chilled mirror sensor probe and optional Precision Air Temperature Sensor. Extremely versatile, the probe can be inserted into air circulation ducts, engine exhaust pipes, engine air intake manifolds, process chambers, isolation chambers- the applications are numerous! Simple and convenient, the remote probe comes standard in 3 m length but is available in longer lengths- inquire with your local dealer more information.
Features:
Primary Standard Chilled Mirror Sensor
Insertion probe or local wall mount
Configurable Analog Outputs
Configurable Relay Alarm Outputs
Bi-Directional Serial Interface
With or Without Display
Standard 24 VDC powered, VAC optional
Benefits:
Improved accuracy over typical probes
Reduced foot-print with remote sensor
Eliminate false readings
Long Life, serviceable sensor
Fast response in detecting upset conditions
Save Money! Economical Solution
Flexible Sensor Platform Choices
Environmental Configuration Options
Wall Mount: IP65 Plastic enclosure or Aluminum Enclosure
Surface Mount for installation within chambers or remote sensor on a wall
Duct Mount: Sensor probe configured with a flange and gasket to seal in-situ
penetration of typical HVAC air duct or sealed enclosure
Pipe Mount; Sensor is fitted with ¼” NPT male thread to adapt to a pipe
Uni-Strut Mount: great for process skids, OEM equipment, upper ceiling mounting
Remote Type: Tethered Sensor Probe may be installed close to measuring point
http://www.edgetechinstruments.com/
Edgetech Instruments Inc. An ISO 9001 Certified Company 399 River Road . Hudson . MA . 01749
Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348 . www.edgetechinstruments.com
Page
1
Sensor/ Sampling Configuration Options
All versions feature the D-Series probe type, chilled mirror sensor
The D-probe may be mounted at the transmitter unit (local) or mounted (remote) tethered on
a signal cable. (factory configured).
The standard D-Probe is configured for direct diffusion sampling.
To measure an extracted flow of sample gas, the optional Flow Through Cover (SC) or the
Sample Chamber (SC1) may be installed onto the D-probe (includes fittings).
A precision Air Temperature Probe is optional. It is typically installed in the same
configuration as the Chilled Mirror probe (local or remote). Temperature measurement is
required to calculate RH which is also displayed Relative Humidity.
Depending on your application, you can choose the ideal sensor construction.
TO ORDER: Determine type of measurement: DewPoint, Relative Humidity, or Temperature. If you
need to measure RH, then you also need to include the temperature probe.
Determine local mounted sensor(s) at control unit or remote mount sensor(s)
Determine sensor configuration
Determine the power input type. 24VDC is standard,110/220 VAC is optional.
Determine if you need a local display
1. Select type enclosure based on the application
2. Select Local or Remote Sensor
3. Select sensor mirror configuration based on sample gas constituents
4. Select if you need precision air temperature sensor (needed for RH%)
5. For remote sensor choose standard length or longer remote sensor cables
6. Select Display or No Display
7. Choose Power Options
8. Select Special Sensor Probe Options such as Pipe Mount, Flange Mount, Aspirator,…
9. Select Additional Options such as special accuracy
10. List as separate line items additional choices such as Accessories, Calibration Packages,
and Extended Warranty.
DT- - - - - - - - - ENCLOSURE LOCAL/REMOTE MIRROR AIR TEMP CABLE DISPLAY POWER PROBE OPTIONS OPTIONS
For Example: DT-PL-R-RD is a Wall Mount IP65 Plastic Enclosure, Remote Sensor w/ local display
ONLY LIST OPTIONS CHOSEN
http://www.edgetechinstruments.com/
Edgetech Instruments Inc. An ISO 9001 Certified Company 399 River Road . Hudson . MA . 01749
Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348 . www.edgetechinstruments.com
Page
2
1. CHOOSE ENCLOSURE TYPE
-PL: PLASTIC IP 65 Standard enclosure
-AL: ALUMINUM NEMA 4 for added durability
2. CHOOSE LOCAL WALL MOUNT or REMOTE MOUNT SENSOR
-W: Wall Mount, Sensor is local at DewTrak Great for measuring ambient air or place the entire unit into chamber
-R: Remote Mount, Sensor is connected to DewTrak w/ 10 ft (3M) cable, place the sensor at the measured point
Edgetech Instruments
DEWTRAK II
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
Plastic
IP65
Aluminum
NEMA 4
Edgetech Instruments
DEWTRAK II
DEWTRAK II
Edgetech Instruments
DEWTRAK II
Local Sensor- Wall Mount Remote Sensor
DEWTRAK II
Plastic EnclosurePlastic Enclosure
Aluminum Enclosure Aluminum Enclosure
http://www.edgetechinstruments.com/
Edgetech Instruments Inc. An ISO 9001 Certified Company 399 River Road . Hudson . MA . 01749
Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348 . www.edgetechinstruments.com
Page
3
3: Choose Sensor Mirror Type for Chemical Compatibility
4. CHOOSE IF YOU DESIRE
PRECISION AIR TEMPERATURE SENSOR
(REQUIRED FOR RH MEASUREMENT)
-ATDT/W Wall mount temperature probe
-ATDT/R Remote mount temperature probe 10’ cable
Platinum Resistive Temperature Sensor
5. Additional Signal Cable Length for Remote Probes
-ECDT Additional cable length, up to 50 feet(15.24m) for both AT and dew point sensor
This increases both the Chilled Mirror Sensor and Air Temp Probe Cables
-ECDT1 Additional cable length, up to 50 feet(15.24m) for AT only
-ECDT2 Additional cable length, up to 50 feet(15.24m) for CM Sensor only
Applications CM Configuration
General Purpose
Gases Acids Caustics Salts Organics
Nuclear Application
High Temperature
Chrome Plated Copper A D D C C D C
316 Stainless Steel A B B B B C B
Platinum A A A A A A A
A Excellent
B Very Good
C Good
D Not recommended
NR Not Rated
DEWTRAK II
10' L
(3M)
DEWTRAK II
http://www.edgetechinstruments.com/
Edgetech Instruments Inc. An ISO 9001 Certified Company 399 River Road . Hudson . MA . 01749
Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348 . www.edgetechinstruments.com
Page
4
6. CHOOSE DISPLAY OR NO-DISPLAY
No designation = No Display
-RD for plastic enclosure
Not available with the aluminum enclosure
2 Line display of measured parameters and alarm conditions
7. Choose Power Options:
No Designator: Standard is 24 VDC. No adder
-ACDT: 85 to 230VAC 50/60Hz power supply
(Enclosure Height Increase, see figure to the right)
8. Choose Special Options for D-Probe:
-D Duct Mount Flange w/ Seal. This option only available for Local Wall Mount Sensor Enclosures
-TFM Temperature Probe Flange Mount. 4inch diameter PVC flange w/ gasket assembly for AT
-AR Aspirator Mount, this features a built in aspirator to extract a gas sample from the surrounding area Great for room air, isolation chamber, test cell, or glove box monitoring
-P Pipe Mount, mounts to the D-Probe and allows 1.25inch Male NPT port on the probe Connect directly to air headers, process piping, or enclosure penetrations
-F Pipe Flange Mount w/ Gasket, The D-Probe gets installed into a 4inch diameter Grey PVC Flange with Rubber gasket seal, 4 bolt install. For use with Pipe Flanges, isolation chamber, and HVAC DUCT Mounting. A rubber gasket seals the flange to a matching 4” flange, DUCT, or chamber wall.
-SM Surface Wall Mount, The D-Probe is retained between two polypropylene blocks w/ bracket Great for ambient air, isolation chamber, or glove box monitoring by diffusion flow.
-US Uni-Strut Mount, Same as the surface mount except the blocks are mounted on a unistrut clamp. Connect to standard unit-strut for adjustable location within industrial applications. Great for process skids, dryer, clean rooms, isolation chamber, or glove box. Uni-Strut not provided.
-SC1 Sample Chamber High Pressure (up to 100psig), Permanently connected to probe . Converts the D-Probe from diffusion sampling to flow through sampling. Provides ¼ inch compression fittings for connection to tubing. Can be used with the SMU vacuum Pump or with positive pressure samples up to 100 psig.
-SC Sample Chamber Low Pressure, same as -SC1, not permanent but is Slip-On. Converts the D-Probe from diffusion sampling to flow through sampling. Provides ¼ inch compression fittings for connection to tubing. Can be used with the SMU Pump or positive pressure up to 1 psig.
FAIL SAFE
RELAY BOX
10' Power
Cord
RH 49.0% P 150 PSIG
T 23.7C DP 12.4C
4.53in (115.0mm)
5.12in (130.0mm)
5.1
2in
(1
30
.0m
m)
4.5
3 in
(1
15
mm
)
4.53in (115.0mm)
4.5
3 in
(1
15
mm
) COVER
REMOVED TO
SHOW
MOUNTING
HOLES
5.1
2in
(1
30.0
mm
)
3.90in (99.0mm)
RH 49.0% P 150 PSIG
T 23.7C DP 12.4C
4.53in (115.0mm)
5.12in (130.0mm)
8.8
2 in
(2
24
.03
mm
)
4.5
3 in
(1
15
mm
)
3.90in (99.0mm)
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
Display
DEWTRAK II
No
Display
Display only available on the Plastic Enclosure
http://www.edgetechinstruments.com/
Edgetech Instruments Inc. An ISO 9001 Certified Company 399 River Road . Hudson . MA . 01749
Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348 . www.edgetechinstruments.com
Page
5
HVAC DUCT
MOUNT
PIPE FLANGE
MOUNT
SURFACE- WALL
MOUNT
UNI-STRUT
MOUNT
Pipe Mount
(1.25NPT)
Aspirator
Mount
SC
Sample Chamber
Low Pressure
SC1
Sample Chamber
High Pressure
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
RH 49.0%
T 23.7C DP
12.4C
HP125-DCM
RH 49.0%
T 23.7C DP
12.4C
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
DEWTRAK IIRH 49.0%
T 23.7C DP
12.4C
DEWTRAK II
1.25" NPT
PIPE MOUNT
WALL MOUNT
SURFACE WALL
MOUNT
UNI-STRUT MOUNT
FLANGE MOUNT
(FOR PIPE FLANGE, DUCT MOUNT,
CHAMBER PENETRATION
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
DUCT
FLANGE
MOUNT
TEMP PROBE
FLANGE
MOUNT
http://www.edgetechinstruments.com/
Edgetech Instruments Inc. An ISO 9001 Certified Company 399 River Road . Hudson . MA . 01749
Main: +1 (508) 263-5900 . Fax:+1 (508) 486-9348 . www.edgetechinstruments.com
Page
6
9 Additional Options
-RTD Secondary RTD output that directly measures mirror temperature (Resistive). For use in systems
where redundant direct measurement of chilled mirror surface is required.
-SA/0.1 Special Accuracy + 0.1C Dew Point
-SA/0.15 Special Accuracy + 0.15 C Dew Point
ACCESSORIES/ SPARE PARTS/ SERVICES:
- SMU: Sample Pump 115/ 230 VAC powered
Includes On/Off switch, controlled Flow
Diagram at right shown with optional sample chamber
-SC/D Spare SC1 Cover
-SC/S Spare SC Cap
-CG Spare Cord Grip for cable entry
-RG Spare Rubber Gasket for Flange Mount
-3YEW 3 Year Extended Warranty, includes any repairs within the warranty statement
-3YNIST1P 3 CALIBRATIONS FOR THE PRICE OF 2, INCLUDES NIST TRACEABLE CERTIFICATE (DEW POINT)
-3YNIST2P 3 CALIBRATIONS FOR THE PRICE OF 2, INCLUDES NIST TRACEABLE CERT. (2 PARAMETERS)
Typical Application
of the SMU Sample ModuleSample Extraction using Vacuum Pump
SAMPLE MODULE
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
¼ inch
Tubing
From
sampling
point
Sample
Chamber
Remote Sensor w/ SC1 Sample Chamber
Remote Sensor
w/ Pipe Mount
Standard Power: 24 VDC
OUTPUTS:
(2) Analog Voltage or 4-20 mA
RS-232 Serial Interface
(2) Alarm Relays
RH 49.0%
T 23.7C DP
12.4C
DEWTRAK II
Shown with
SC1 sample chamber
DEWTRAK II
RH 49.0%
T 23.7C DP
12.4C
DEWTRAK II
10' L
(3M)
RH 49.0%
T 23.7C
DP 12.4C
Edgetech Instruments
DEWTRAK II
http://www.edgetechinstruments.com/